SU887717A1 - Device for checking soil consolidation quality - Google Patents
Device for checking soil consolidation quality Download PDFInfo
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- SU887717A1 SU887717A1 SU792820700A SU2820700A SU887717A1 SU 887717 A1 SU887717 A1 SU 887717A1 SU 792820700 A SU792820700 A SU 792820700A SU 2820700 A SU2820700 A SU 2820700A SU 887717 A1 SU887717 A1 SU 887717A1
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- USSR - Soviet Union
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- punch
- stamp
- central
- ring
- load
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Description
иа фиг. 2 - то же, но при выполнении устройства с акселерометром и соединением корпуса с базовой машиной; на фиг. 3 - электрическа схема замера ускорени штампа.FIG. 2 - the same, but when the device is executed with an accelerometer and case connection with the base machine; in fig. 3 is an electrical circuit for measuring acceleration of a stamp.
Устройство включает полый корпус 1 с внутренним выступом 2 и соосно установленный с ним кольцевой штамп 3, центральный штамп 4 с выступом 5 и расположенными между ним и кольцевым штампом 3 упругими элементами 6 и 7, установленный в центральном штампе 4 датчик силы 8, обмотки 9 и 10, датчик перемещени 11. Электрическа схема устройства включает источник питани 12, выключатель 13, дифференциальный трансформатор 14 с обмотками 15 и 16. Полый корпус установлен на раме 17 базовоймашины , например, катка.The device includes a hollow body 1 with an internal protrusion 2 and an annular stamp 3 coaxially mounted with it, a central stamp 4 with a protrusion 5 and elastic elements 6 and 7 located between it and the ring stamp 3, a force sensor 8 installed in the central stamp 4, a winding 9 and 10, displacement sensor 11. The electrical circuit of the device includes a power source 12, a switch 13, a differential transformer 14 with windings 15 and 16. The hollow body is mounted on the frame 17 of the base machine, for example, a roller.
Устройство работает следующим образом .The device works as follows.
Полый корпус устанавливают на уплотненный грунт, и под действием мерной нагрузки Р центральный штамп 4 деформирует грунт на величину /. Упругие элементы 6 и 7 имеют первоначальное сжатие, уравновешивающее массу штампа 4 и заданную жесткость, а площадь опорной поверхности кольцевого штампа 3 значительно превосходит площадь опорной поверхности центрального штампа 4. Поэтому при действни нагрузки Р, многократно превосход щей нагрузку от массы штампа 4, кольцевой штамп 3 практически не деформирует грунт, и шток датчика перемещени (прогибомера) И перемещаетс также на величину /, при этом вырабатываетс пропорциональный перемещению электрический сигнал, который подаетс к регистрирующему прибору (не Показан). Соответственно датчик силы 8 вырабатывает сигнал, пропорциональный действующей силе Р, также «подаваемый к прибору. Зна величину Р и /, а также диаметр щтампа4, по известным зависимост м определ ют модуль деформации грунта, а лри наличии соответствующих тарировочных графиков или номограмм - плотность скелета грунта.The hollow body is mounted on a compacted soil, and under the action of dimensional load P, the central stamp 4 deforms the soil by the value of /. The elastic elements 6 and 7 have an initial compression, balancing the mass of the stamp 4 and a given stiffness, and the area of the bearing surface of the ring stamp 3 significantly exceeds the area of the supporting surface of the central stamp 4. Therefore, when the load P, many times surpassing the load from the mass of the stamp 4, the ring stamp 3 practically does not deform the soil, and the displacement sensor shaft (deflection gauge) also travels by an amount of /, and an electrical signal is produced that is proportional to the displacement and is supplied a recording device (not shown). Accordingly, the force sensor 8 generates a signal proportional to the acting force P, also “supplied to the device. Knowing the magnitude of P and /, as well as the diameter of the cartridge4, the modulus of the soil deformation is determined by known dependencies, and if there are corresponding calibration charts or nomograms, the density of the soil skeleton.
После сн ти нагрузки штамп 4 автоматически возвращаетс в исходное положепие и готов к следующему нагружению. При устаиовке корпуса 1 на базовой машине , например на раме 17 уплотн ющего катка, при воздействии нагрузки Р центральный штамп 4 посредством упругого элемента 6 увлекает кольцевой штамп 3 до соприкосновени с грунтом, и далее процесс происходит аналогично описанному выше. После сн ти нагрузки кольцевой штамп 3 и центральный штамп 4 под воздействием силы сжати упругих элементов 6 и 7 возвращаетс в исходноеAfter removal of the load, the stamp 4 automatically returns to the initial position and is ready for the next loading. When mounting case 1 on the base machine, for example, on frame 17 of the compacting roller, under the influence of load P, the central stamp 4 by means of the elastic element 6 draws the ring stamp 3 before contact with the ground, and then the process proceeds as described above. After removal of the load, the ring stamp 3 and the central stamp 4 under the influence of the compressive force of the elastic elements 6 and 7 return to the original
положение. Усилие предварительного сжати упругого элемента 7 уравновешивает массы штампов 3 и 4. При этом нагрузка к штампу 4 может прикладыватьс статически или динамически.position. The pre-compression force of the elastic element 7 balances the weights of the dies 3 and 4. In this case, the load on the die 4 can be applied statically or dynamically.
При динамическом приложении нагрузки скорость перемещени штампа 4 при деформировании грунта переменна. Поэтому при установке на штамп 4 обмотки 9,With dynamic load application, the speed of movement of the punch 4 when the soil is deformed is variable. Therefore, when installed on the stamp 4 winding 9,
соедин емой иа момент удара с источником питани 12, в обмотке 10 будет индуцироватьс переменна ЭДС, пропорциональна скорости перемещени штампа 4, а во вторичной обмотке 16 днфференциального трансформатора 14 будет возникать ток, пропорциональный ускорению перемещени штампа 4. РГспользу известное из второго закона Ньютона соотношение между ускорением, массой штампа и действующей на него силой, можно протарировать показание прибора, соединенного с обмоткой 16, непосредственно в единицах действующей на центральный штамп 4 датчика силы. Преимущество такого способа замера - больша величина снимаемого с обмотки 16 сигнала, позвол ющего обходитьс без усилител . Замыкание контактов выключател 13 на врем удара может производитьс инерционным устройствомat the moment of impact with the power source 12, in the winding 10 a variable emf will be induced, proportional to the speed of movement of the stamp 4, and in the secondary winding 16 of the differential transformer 14 there will be a current proportional to the acceleration of the movement of the stamp 4. The ratio between the acceleration, the mass of the punch and the force acting on it can be traded over the reading of the device connected to the winding 16 directly in units acting on the central punch 4 of the sensor b s. The advantage of this method of measurement is the large amount of signal taken from the winding 16, allowing it to be bypassed without an amplifier. The closure of the contacts of the switch 13 at the time of impact can be made inertial device
(не показано). Устройство обеспечивает увеличение производительности труда и точности контрол уплотненного грунта и может быть использовапо в транспортном, автодорожном, аэродромном и гидротехническом строительстве при возведении земл ных сооружений.(not shown). The device provides an increase in labor productivity and precision control of compacted soil and can be used in transport, road, airfield and hydraulic engineering during the erection of land structures.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU792820700A SU887717A1 (en) | 1979-09-18 | 1979-09-18 | Device for checking soil consolidation quality |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU792820700A SU887717A1 (en) | 1979-09-18 | 1979-09-18 | Device for checking soil consolidation quality |
Publications (1)
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SU887717A1 true SU887717A1 (en) | 1981-12-07 |
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SU792820700A SU887717A1 (en) | 1979-09-18 | 1979-09-18 | Device for checking soil consolidation quality |
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1979
- 1979-09-18 SU SU792820700A patent/SU887717A1/en active
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